| Zodiac密码算法的多维零相关线性分析 |
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| 引用本文： | 程璐,魏悦川,潘晓中,李安辉.Zodiac密码算法的多维零相关线性分析[J].计算机应用,2017,37(6):1605-1608. |
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| 作者姓名： | 程璐 魏悦川 潘晓中 李安辉 |
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| 作者单位： | 1. 武警工程大学 电子技术系, 西安 710086;2. 网络与信息安全武警部队重点实验室, 西安 710086 |
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| 基金项目： | 国家自然科学基金资助项目（61202492，61572521）；信息保障技术国家重点实验室开放基金（KJ-15-010）；陕西省自然科学基金资助项目（2016JQ6030）。 |
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| 摘 要： | 分组密码算法Zodiac支持3种密钥长度，分别为Zodiac-128、Zodiac-192、Zodiac-256。利用零相关线性分析方法评估了Zodiac算法的安全性，首先根据算法的结构特性，构造了一些关于Zodiac算法的10轮零相关线性逼近，然后对16轮Zodiac-192进行了多维零相关分析。分析结果显示：攻击过程中一共恢复了19个字节的密钥，其数据复杂度约为2124.40个明密文对，计算复杂度为2181.58次16轮加密。由此可得：16轮（即全轮）192 bit密钥的Zodiac算法（Zodiac-192）对于零相关线性分析方法是不安全的。
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| 关 键 词： | 分组密码 Zodiac密码算法 线性掩码 线性逼近 零相关线性分析 |
| 收稿时间： | 2016-12-12 |
| 修稿时间： | 2017-02-26 |
Multidimensional zero-correlation linear cryptanalysis on Zodiac cipher algorithm |
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| CHENG Lu,WEI Yuechuan,PAN Xiaozhong,LI Anhui.Multidimensional zero-correlation linear cryptanalysis on Zodiac cipher algorithm[J].journal of Computer Applications,2017,37(6):1605-1608. |
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| Authors: | CHENG Lu WEI Yuechuan PAN Xiaozhong LI Anhui |
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| Affiliation: | 1. Department of Electronic Technology, Engineering College of the Armed Police Force, Xi'an Shaanxi 710086, China;2. Key Laboratory of Network & Information Security under the Chinese Armed Police Force, Xi'an Shaanxi 710086, China |
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| Abstract: | Zodiac is a block cipher algorithm and it supports 3 master key lengths which are called Zodiac-128, Zodiac-192 and Zodiac-256. The security of Zodiac algorithm was evaluated by using zero-correlation linear cryptanalysis. Firstly, 10-round zero-correlation linear approximations of Zodiac algorithm were constructed according to the structural characteristics of the algorithm. Then, the multidimensional zero-correlation linear cryptanalysis on 16-round Zodiac-192 was conducted. The analysis results show that 19-byte keys were restored totally in the process of attack, the data complexity was about 2124.40 known ciphertexts and the computational complexity was 2181.58 encryptions of 16-round. Thus the Zodiac-192 algorithm with the 192-bit key of 16 rounds (full rounds) is not immune to the zero-correlation linear cryptanalysis. |
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| Keywords: | block cipher Zodiac cipher algorithm linear mask linear approximation zero-correlation linear cryptanalysis |
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